<html>
  <head>
    <meta charset="utf-8" />
    <style>
      * {
        padding: 0;
        margin: 0;
      }

      button {
        display: inline-block;
      }
    </style>
  </head>

  <body>
    <div
      id="output"
      style="height: 400px; width: 600px; background: #eee"
    ></div>
    <button id="rock" style="height: 40px; width: 80px">石头</button>
    <button id="scissor" style="height: 40px; width: 80px">剪刀</button>
    <button id="paper" style="height: 40px; width: 80px">布</button>
  </body>
  <script>
    const $button = {
      rock: document.getElementById("rock"),
      scissor: document.getElementById("scissor"),
      paper: document.getElementById("paper")
    };

    const $output = document.getElementById("output");

    Object.keys($button).forEach(key => {
      $button[key].addEventListener("click", function() {
        fetch(`http://${location.host}/game?action=${key}`)
          .then(res => {
            return res.text();
            console.log(1);
            console.log(res);
          })
          .then(text => {
            console.log(2);
            console.log(text);
            $output.innerHTML += text + "<br/>";
          });
      });
    });
  </script>
</html>
